Microwave channelized bandpass filter having two channels

Details Microwave channelized bandpass filter having two channels Microwave channelized bandpass filter having two channels

H - Electricity

01

P

H01P 1/213 (2006.01) H01P 1/20 (2006.01) H03F 3/60 (2006.01) H03H 11/04 (2006.01) H03H 11/34 (2006.01)

Patent

CA 2321624

A channelized active bandpass filter having only two branches which provide respective frequency-selective feed-forward signal paths. The two signal paths have overlapping frequency response bands such that the combination of the two paths provides a composite filter with a bandpass response. The two branches may be provided with bandpass transfer characteristics of different orders and shapes, such as a second-order response and a fourth-order response. Two-way signal splitting and combining to define the two channels may be performed with in-phase splitters (10) and combiners (24), for example, or diplexer circuits, each composed of two bandpass filters (16, 18) with different characteristics but overlapping frequency responses and preferably approximately equal center frequencies. Combinations of the two splitting and combining arrangements are also usable.

L'invention concerne un filtre passe-bande multicanaux actif possédant seulement deux branches qui permettent de former des trajets respectifs à sélection de fréquence des signaux émis en aval. Les deux trajets de signaux possèdent des bandes de réponses en fréquence chevauchantes, choisies de manière à ce que la combinaison des deux trajets permette de créer un filtre composite à réponde passe-bande. On peut conférer aux deux branches des caractéristiques de transfert passe-bande d'ordre et de forme différents, par exemple, une réponse de deuxième ordre et une réponse de quatrième ordre. On peut effectuer la séparation et la combinaison bidirectionnelles des signaux visant à définir les deux canaux au moyen de séparateurs (10) et de combineurs (24) en-phase ou avec des circuits diplexeurs dont chacun est constitué de deux filtres passe-bande (16, 18) possédant des caractéristiques différentes mais ayant des réponses en fréquence chevauchantes et, de préférence, des fréquences centrales égales. On peut également utiliser des combinaisons des deux montages de séparation et de combinaison.

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